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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aefda229e007c40c8d6ae7d53dd75ea34b62dd5cf9688e6e9dbc01a0d0b4da3' 
  AND token = 'v5j4+XiJrjxqtVIG0sap/iPiRNJPHzmEYAGGvR6l8VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}